Long ago they did indeed say that. But then they started making classified as small ships that are physically bigger than the Freelancer and so are they small ships capable of going throughs mall jump points or are they physically restricted to medium? It is the same issue they had with cargo space and landing pad size both of which have had several iterations and now a metric established for the same will need to happen for jump gates. Until then there is no definitive answer as to what ship will fit through which jump gate or if jump gate size is just a suggestion based on the ease a ship will be able to navigate the jump tunnel and take a page from what ships fit in others.
In fact in the Mercury Q&A they said
Then there is the Shipyard ship technical information
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This is all to say that yes while it was once true many years ago that it was mentioned the freelancer before it was reworked would be the largest ship to fit through a small jump point I wouldn't hold that comment as set in stone and fully expect it to no longer be relevant.